bsd/sys/eventvar.h

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*-
  23  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  36  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  38  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  39  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  40  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  41  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  42  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  43  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  44  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  45  * SUCH DAMAGE.
  46  *
  47  *      $FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
  48  */
  49
  50 #ifndef _SYS_EVENTVAR_H_
  51 #define _SYS_EVENTVAR_H_
  52
  53 #include <sys/event.h>
  54 #include <sys/select.h>
  55 #include <kern/kern_types.h>
  56
  57 #define KQ_NEVENTS      16              /* minimize copy{in,out} calls */
  58 #define KQEXTENT        256             /* linear growth by this amount */
  59
  60 struct kqueue {
  61         decl_lck_spin_data( ,kq_lock)           /* kqueue lock */
  62         int             kq_state;
  63         int             kq_count;               /* number of queued events */
  64         struct kqtailq  kq_head;                /* list of queued events */
  65         struct kqtailq  kq_inprocess;           /* list of in-process events */
  66         struct selinfo  kq_sel;         /* parent select/kqueue info */
  67         struct filedesc *kq_fdp;
  68
  69 #define KQ_SEL          0x01
  70 #define KQ_SLEEP        0x02
  71 #define KQ_PROCWAIT     0x04
  72 };
  73
  74 extern struct kqueue *kqueue_alloc(struct proc *);
  75 extern void kqueue_dealloc(struct kqueue *, struct proc *);
  76
  77 typedef int (*kevent_callback_t)(struct kqueue *, struct kevent *, void *);
  78 typedef void (*kevent_continue_t)(struct kqueue *, void *, int);
  79
  80 extern int kevent_register(struct kqueue *, struct kevent *, struct proc *);
  81 extern int kevent_scan(struct kqueue *, kevent_callback_t, kevent_continue_t,
  82                        void *, struct timeval *, struct proc *);
  83
  84 #endif /* !_SYS_EVENTVAR_H_ */